#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define rep(i, a, b) for (int i = (a); i <= (b); i++)
#define per(i, a, b) for (int i = (a); i >= (b); i--)
#define endl '\n'
const int N = 2e5 + 5;

int n, m;
int a[N];

int main() {
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  cin >> n;
  int s = 0, cnt = 0;
  while (n--) {
    string op;
    cin >> op;
    if (op == "login")
      s = 1;
    else if (op == "logout")
      s = 0;
    else if (op == "private") {
      if (s == 0) cnt++;
    }
  }
  cout << cnt;
  return 0;
}